adj.
Pronunciation: ' te-n ə -br ə s
Function: adjective
Etymology: Middle English, from Anglo-French tenebreus, from Latin tenebrosus, from tenebrae
Date: 15th century
1 : shut off from the light : DARK , MURKY < tenebrous depths>
2 : hard to understand : OBSCURE <a tenebrous affair>
3 : causing gloom